Halogen derivative of alpha-naphthoyl-omicron-benzoic acid



v ROGER ,A'DAMS, OF URBANA, ILLINOIS,

Kit

Patented July 1]., i933 user sra'rss PATENT OFFICE VIKTOR M. WEINMAYR, or imiairman;

DE N'EIvIOUES & COMPANY, OF VIILJE'IINGTON, DELAWARE, A; CORPORATION OF DELA- WARE No Drawing.

This invention relates to novel intermedi ates for dyestuffs. More particularly, this invention deals with novel halogen derivatives of alpha-naphthoyl-o-benzoic acid.

By alpha-naphthoyl-o-benzoic acid we are referring to the compound represented by the formula:

It may also be designated as l-naphthoyl-2- benzoic acid. This compound and some of its derivatives are useful for the preparation of the corresponding derivatives of 1, 2ben zanthraquinone. Certain halogen derivativesof this compound have been known in the art, and have been preparedgenerally by condensing a halogenated naphthalene body with phthalic anhydride or halogenated phthalic anhydride with naphthalene. I We have now found that halogenated alpha-naphthoyl-o-benzoic acid may be produced by direct halogenation of alpha-naphthoyl-o-benzoic acid. Moreover, the products appear to be novel and different from any of the known halogen derivatives of this compound. Further study and research convinced us that the halogen enters into the alpha positions of the naphthalene ring, and depending on the degree of halogenation, will displace the hydrogen in the 5-pos ition only or in the 5- and 8'-positions. I

It is accordingly an object of this invention to provide a process for preparing novel HALOGEN DERIVATIVE OF a-NAPHTHOYL-O-BENZOIC ACID Application filed March 16, 1932. Serial No. 599,336.

halogen derivatives of alpha-naphthoyl-obenzoic acid, having the general formula:

wherein X stands for hydrogen or halogen. Other important objects of thisinvention will appear as the description proceeds.

I-IANFORD JOHNSON, or GREEN BAY, Ann Wisconsin, ASSIGNORS TO n. I. no ron'r Our preferred method of halogenation com-- prises dissolving alpha-na'phthoyl-o-benzoic acid inacetic acid and passing in chlorine or bromine until one or two molecular weights of halogen have been consumed, depending on whether the monohalogen or di-halogen compound is desired. The dihalogen compound may also beprepared by starting with the corresponding monohalo'gencompound and subjecting to halogenation as above.

Other solvents orcother halogenating agents; may 'be used; If sulfuric acid is used as solvent, the reaction proceeds rapidly toward the production of the dihalogen, compound,

without stoppingat the intermediate monohalogen stage.

Without limitingour invention toany pari ticular procedure, the following examples Wlll serve to illustrate our preferred mode of operatlon. Parts given are parts by weight.

TolOO parts of alpha-naphthoyl-o-ben- Zoic acid in a flask fitted with a reflux condenser, are-added 100 parts of glacial acetic acid and 70 parts of bromine, and the mix ture is refluxed for t hours. The reaction mixture is then cooled in an ice-salt bath until I it has all solidified.. On warming the flask to centrated' sulfuric acid in is filtered off and dried. The compound is purified by repeated recrystallization from toluene and has a melting point of 203204 C. Analysis shows it to be a mono-bromo derivative of alpha naphthoyl o-benzoic acid.- By fusion with caustic alkali at 200 C., it yields 5-hydroxy-1-naphthoic acid. l/Vhen ring-closed with concentrated sulfuric acid in the optional presence of boric acid, it yields a Bz-monobromobenzanthraquinone of melting point, 231-232 C.

The brominated compound therefore 5- bro'inio-Y-naphthoyl-2-benzoic acid of the formula COOH 5 parts of purified alpha-naphthoyl-o-benzoic acid are ground with a trace of ferric chloride and a traceofiron. powder and placed in a. suitable vessel. '16 parts of bromine are allowed to drop slowly onto this mixture. After the bromine is all added, the reaction mixture is allowed to stand for 3-4 hours at room temperature and is then treated with dilute sodium hydroxide solu tion, whereupon all of the product dissolves in the boiling solution, leaving a residue of ferric hydroxide. This is filtered off, andon cooling, a small amount of the sodium salt precipitates. The solution is acidified with dilute hydrochloric acid, and a White precipitate is produced. Ths compound is purified by crystallization from toluene. It forms fine white needles of melting point 260261C. It analyzes 2 bromine atoms per molecule. 'lVhen ring closed, with conthe optional presence of boric acid, it yields a dibromo-benzanthraqui none which is a bright yellow solid and melts at 265-266 C.

The bromination compound is therefore most probably 5,8-dibromo-1-naph'thoyl- 2-benzoic acid of the formula:

I Br

ooon 276 parts of alpha-naphthoyl-o-benzoic acid are dissolved in 1370 parts of 93% sulfuric acid at 50 C. 160 parts of bromine are added slowly at this temperature, which melts at 237-238 C., and the other at 304 C uct, when recrystallized from glacial acetic acid gives a constant melting point of 260-261 0., and is identical with the prodnet of Example 2.

414 parts of alpha-naphthoyl-o-benzoic acid are dissolved in 500 parts of glacial acetic acid and treated at 114] 18 C. with chlorine gas until it increases in weight by about 53 parts. The red solution is poured onto 500 parts of ice and water and the precipitate is filtered, washed and dried. Yield 440 parts, which is equal to 94.4% of theory. By repeated recrystallizatioi'i from toluene a pure 5-chloro-l.-naphthoyl-o-benzoic acid obtained with a melting point of 179480 0. lVhen ring-closed with concentrated sulfuric ac d in the optional presence of boric acid, it gives a Bz-chloro-benzanthraquinoue compound, melting at about 232 C.

Example 5.5,6aicbloro-l-naphth0g Z-2- beaeoic acid 2. 6 parts of alpha-naphthoyl-o-benzoic acid are dissolved in. 1370 parts of 98% sulfuric acid and chlorine is fed in at 8040 C. to a final increase in weight of 87 parts. The solution is then diluted with ice and water, filtered and washed. The cake is extracted with hot, dilute caustic soda, leaving a'residue of about 92 parts, consisting of a. miX- ture of benzanthraquinone and chlorinated benzanthraquinone. The alkaline extracting liquor, containing the soluble material, is run into acid, and the precipitate formed is filtered and washed. When recrystallized from acetic acid, pure 5,8dichloro-1- naphthoyl-2-benzoic acid is obtained, with a meltingv point of 242 C. This compound, when ring-closed with sulfuric acid in the presence of boric acid gives a mixture of two dichloro-benzanthraquinones, one of which The two may be separated by fractional crystallization from an organic solvent, such as chlorobenzene, or by extracting the low melting component with toluene and crystallizing the other component from nitrobenzene.

It will be understood that many variations and modifications are possible in the above procedures without departingfrom the spirit of this invention. v

1. A process for producing ahalogenated derivative of alpha-naphthoyl-o-benzoic acid having the general formula:

wherein X stands for H or halogen, which comprises reacting with halogen upon alphanaphthoyl-o-benzoic acid.

2. A process for producing a halogenated. derivative of alpha-naphthoyl-o-benzoic acid which comprises reacting with halogen upon alpha-naphthoyl-o-benzoicacid in acid medium.

' 3. A process for producing 5,8-dihalogen-1-naphthoyl-2-benzoic acid which comprises reacting with halogen upon alphanaphthoyl-o-benzoic acid dissolved in sulfuric acid.

4. A. halogenation derivative of alphanaphthoyl-o-benzoic acid possessing the fol lowing general formula:

wherein X standsfor H or halogen.

5. 5 8'-dihalogen-l-naphthoyl-2-benzoic acid.

6. 5 -halogen-1naphthoyl-2-benzoic acid. 7. A bromination derivative of alphanaphthoyl-o-benzoic acid possessing the following general formula:

wherein X stands for H or Br.

'8 5-bromo -1-naphthoyl-2-benzoic acid. 9. A chlorination derivative of alphanaphthoyl-o-benzoic acid possessing the following general formula:

-oo- I ,ooo11 wherein X stands for H or Cl;

' 10. 5,8-dichloro 1 naphthoyl 2 benzoic acid.

11. 5-chloro-1-naphthoyl-2-benzoic acid.

In testimony whereof we aflix our signatures. I i

- ROGER ADAMS.

EARL I-IANFORD JOHNSON; VIKTOR M. WEINMAYR. 

